Spectra Precision Survey Pro v4.6 Recon and Nomad User Manual - Manual (Page 208)

User’s Manual – Conventional Mode
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e. Enter the desired vertical distance between each shot
of the surface being scanned in the Vertical Distance
Interval field.
Distance Grid Advantage and Disadvantages
The advantage of using the Distance Grid method is it is more
intuitive to set up the spacing between shots (distance interval) since
the distance interval can be measured on the surface being scanned
and irrelevant of how far the total station is from the surface.
The disadvantage of the Distance Grid method is it must be possible
for the total station to measure distances to the three required shots
that define the surface perimeter. The curvature or shape of some
surfaces would make measuring distances to all these points
impossible.
Angle Grid
The Angle Grid method requires angle measurements to
be taken at two opposing corners of the surface to be
scanned. (It is not required to shoot distances to these
points.)
There are three ways to define the two corner points, but
most users will choose to shoot the points with a total
station as described below. The first of the other two
method is to enter the horizontal and zenith angles by
hand in their respective HA and ZA fields. The third
method is to toggle the HA/ZA button for the
respective corner to Point where an existing point can
be selected.
a. Aim the total station in the upper-left
corner of the surface to be scanned and
tap Shoot 1.
b. Aim the total station in the lower-right corner of the
surface to be scanned and tap Shoot 2.
Note: The two corner points in the Angle Grid method must
encompass the area to be scanned – they do not have to be on the
surface itself since no distances are measure to these points.